Bluesky's blog
最近在服务器（centos 7, gcc 7.2.0）上装软件时突然发现 在某个文件夹下不能编译软件，报错如下：
[root@localhost libXt-1.1.3]# ./configure --prefix=/share/soft/libXt-1.1.3 checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether to enable maintainer-specific portions of Makefiles... no checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking how to print strings... printf checking for style of include used by make... GNU checking for gcc... gcc checking whether the C compiler works... no configure: error: in `/share/soft_backup/libXt-1.1.3': configure: error: C compiler cannot create executables #不能编译软件 See `config.log' for more details [root@localhost libXt-1.1.3]# gcc --version #怎么弄发现都报错 gcc: 错误：./specs：是一个目录 [root@localhost libXt-1.1.3]# gcc gcc: 错误：./specs：是一个目录
原因是：你在给\$LIBRARY_PATH:赋值时不小心多给了冒号 ”: ”，如：export LIBRARY_PATH=\$LIBRARY_PATH::/share/soft/readline-7.0/lib导致连续两个冒号之间没有目录，所以gcc就把当前路径当成库加载路径,导致报错，从一下可以看出：
[root@localhost libXt-1.1.3]# $LIBRARY_PATH #出现此问题时，我的LIBRARY_PATH如下，有 : : 从而导致报错 -bash: :/share/soft/readline-7.0/lib:/share/soft/libX11-1.5.0/lib:/share/soft/readline-7.0/lib: 没有那个文件或目录
解决办法：重新给$LIBRARY_PATH变量赋值，不要出现::的情况即可
参考：
https://github.com/google/pulldown-cmark/issues/122
http://gcc-help.gcc.gnu.narkive.com/8AbbmxJN/specs-directory-interferes-with-the-operation-of-gcc-in-configure-scripts
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